fenpin.vhd

用NEC编码方式写的红外发送程序,包括三个部分,分频,编码,编码输出

library ieee;                          --1.5MHz分频为38KHz
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity fenpin is
port(clk:in std_logic;
     div40:out std_logic);
end;
architecture one of fenpin is
  signal cnt:std_logic_vector(4 downto 0);
  signal clk_temp:std_logic;
  constant m:integer:=19;
begin
process(clk)
begin
if clk'event and clk='1' then
    if cnt=m then
        clk_temp<=not clk_temp;
        cnt<="00000";
    else
        cnt<=cnt+1;
    end if;
end if;
end process;
div40<=clk_temp;
end;